You only hear success stories, but you don't hear all the things they tried that didn't work out. Success usually doesn't happen overnight, don't sweat it.
A good chair is a good investment, because it makes you more productive and you use it thousands of hours every year.
Herman Miller's Aeron seems like a good chair but personally I think the arm holders are not needed as when coding I put my arms on the table. Also I prefer less wheels because they are in the way.
